20 results about "Glycerol dehydration" patented technology

The invention relates to a kitchen waste oil recovery treatment method, which comprises: S1, carrying out multi-field synergistic pretreatment: sequentially carrying out ultrasonic wave and high-frequency pulse electric field treatment on waste oil to break an emulsion layer, adding magnetic nanoparticles to adsorb polar impurities, and carrying out magnetic field separation to obtain high-purity oil; s2, supercritical catalytic reaction: under the CO2 supercritical condition, using a core-shell structure composite catalyst to synchronously perform transesterification reaction and glycerol dehydration reaction; s3, dynamic membrane separation: separating biodiesel and glycerol in real time through an intelligent membrane assembly; s4, gradient utilization of energy: recovering reaction waste heat to drive membrane distillation to concentrate wastewater, and using tail gas CO2 for carbonation reaction to generate calcium carbonate. Through four core technologies of multi-field collaborative pretreatment, low-temperature supercritical catalysis, dynamic membrane separation and energy gradient utilization, triple limitations on efficiency, cost and environmental protection in the prior art are remarkably broken through.

The invention discloses a molecular sieve catalyst, a preparation method thereof and an application of the molecular sieve catalyst in a reaction for preparing acrolein through glycerol dehydration. The molecular sieve catalyst comprises a hierarchical pore molecular sieve and an auxiliary agent, the hierarchical pore molecular sieve is a hierarchical pore ZSM-5 molecular sieve; the pore size distribution of the hierarchical pore ZSM-5 molecular sieve is 10-30 nm; the auxiliary agent comprises an auxiliary agent element, and the auxiliary agent element is selected from at least one of Zn, Mg and Ca; the content of the auxiliary agent is 0.1-2wt% of the mass of the molecular sieve catalyst. The catalyst can be used in a reaction for preparing acrolein through glycerol dehydration, has excellent conversion rate and selectivity, and has relatively high stability.

The invention discloses a porous dolomite-based supported catalyst and a preparation method and application thereof.The preparation method comprises the steps that natural dolomite is developed into a porous dolomite-based carrier through propionic acid treatment and high-temperature calcination, and molybdenum / vanadium oxide is introduced into the surface of the porous dolomite-based carrier through an impregnation method; the porous dolomite-based supported catalyst is prepared; the method is easy to operate, green and clean, the obtained catalyst can be used for preparing allyl alcohol and acetone alcohol through glycerol dehydration, the conversion rate can reach 90% or above, the selectivity of allyl alcohol and acetone alcohol can reach 75% or above at most, stability is kept along with the reaction time, and a good technical achievement is achieved.

The utility model relates to the technical field of glycerol dehydration, and discloses efficient glycerol dehydration equipment which comprises a tank body and a heating jacket, the heating jacket is fixedly arranged on the surface of the tank body, the top of the tank body is fixedly communicated with a feeding pipe, and the bottom of the tank body is fixedly communicated with a discharging pipe; through the arrangement of the transmission mechanism, glycerol can be put into the tank body from the feeding pipe, then the tank body is heated through the heating sleeve, water contained in the glycerol can generate water vapor after the glycerol is heated, meanwhile, a motor is started, the motor drives a first transmission wheel to rotate, and the glycerol is heated through the heating sleeve. A first transmission wheel drives a second transmission wheel to rotate through a belt, the second transmission wheel rotates, a stirring rod synchronously rotates along with the second transmission wheel, the stirring rod drives a square frame to rotate, and glycerol forms a vortex through stirring, so that the contact area of the glycerol and air is increased, and formation of water vapor is promoted; and the glycerol dehydration effect is further improved.

The present invention discloses a melt-alkalized attapulgite / platinum-based transition bimetallic catalyst and its preparation method and application. The catalyst includes a carrier and an active component supported on the carrier, the carrier being melt-alkalized attapulgite, the active component being platinum and a transition metal, and the transition metal being selected from iron, cobalt, nickel and copper. The catalyst of the present invention can be applied to glycerol aqueous phase reforming hydrogen production and value-added products in the absence of an additional hydrogen source. Its stronger acid site is conducive to the dehydration of glycerol to form hydroxyacetone, and further hydrogenation on the acid site generates value-added products such as 1,2-propylene glycol and 1,3-propylene glycol, showing good prospects for industrial application.

A method of producing acrolein from glycerol is disclosed. The method may include introducing a heterogenous acid catalyst into a reactor. The heterogenous acid catalyst may be a heteropoly acid catalyst or a sulfonic acid catalyst. The heterogenous acid catalyst may be heated to a target reaction temperature while in the reactor. In some cases, the heterogenous acid catalyst may be preheated in the reactor before being heated to the target reaction temperature. Once the heterogenous acid catalyst reaches the target reaction temperature, glycerol may be introduced into the reactor to contact the heterogenous acid catalyst. Contact of the glycerol with the heterogenous acid catalyst causes a reaction that dehydrates the glycerol in the reactor and produces an acrolein-containing effluent. The effluent may be discharged from the reactor and may be subjected to further downstream processing, including converting the acrolein into acrylic acid.

The application provides a preparation method of dry biological tissue, which comprises the following steps: cleaning the biological tissue; cross-linking the cleaned biological tissue; and dehydrating the cross-linked biological tissue, wherein the dehydrating agent in the dehydrating process is selected from one or more than two of the following substances: alcohol ether with high boiling point and low crystallization point, alcohol amine with high boiling point and low crystallization point, alcohol ether solution with high boiling point and low crystallization point, and alcohol amine solution with high boiling point and low crystallization point. Compared with traditional glycerol dehydration or freeze-drying dehydration, the alcohol ether or alcohol amine dehydrating agent with high boiling point and low crystallization point can remove the calcification sites such as phospholipids in the biological tissue in the dehydration process, further improve the anti-calcification performance of the dry biological tissue, and can also give the dry tissue a wider storage temperature condition.

A method of producing acrolein from glycerol comprising introducing in a reactor a heteropoly acid catalyst comprising amorphous silica having heteropoly acid groups; preheating the catalyst in the re

The invention provides a polyglycerol fatty acid monoester product with high purity. Also provided is a method for producing a polyglycerol fatty acid monoester with high purity. A polyglycerol monofatty acid ester product in which the number of carbon atoms in a fatty acid is 4-25, the peak intensity ratio represented by formula (X) is 0.20 or more, and the peak intensity ratio represented by formula (Y) is 0.46 or less. Formula (X) = P2 / P1; formula (Y) = P3 / P1: P1: the sum of peak intensities of a monoester, a monoester dehydrated product, a diester, a diester dehydrated product, a triester, and a triester dehydrated product of a polyglycerol fatty acid ester, and polyglycerol and a polyglycerol dehydrated product when mass spectrometry of a polyglycerol fatty acid ester product is performed using a time-of-flight mass spectrometer; p2: the peak intensity of the monoester of the polyglycerol fatty acid ester when the mass spectrometry of the polyglycerol fatty acid ester product is performed using a time-of-flight mass spectrometer; and P3: the sum of the peak intensities of the polyglycerol and the polyglycerol anhydrate when the mass spectrometry of the polyglycerol fatty acid monoester product is performed using a time-of-flight mass spectrometer.

Acrylic acid is produced by dehydrating glycerol over a first mixed metal oxide catalyst in the presence of oxygen and water to produce acrolein and then oxidizing the acrolein over a second mixed metal oxide catalyst in the presence of oxygen and water to produce the acrylic acid. The first mixed metal oxide catalyst comprises oxides of tungsten and zirconium. The second mixed metal oxide catalyst includes a solid catalyst having the empirical formula AaVbNcXdOe, where A is at least one element selected from the group consisting of Mo and W, N is at least one element selected from the group consisting of Te and Se, and X is selected from the group consisting of Nb, Ta, Ti, Al, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ni, Pt, Bi, B, In, Ce, As, Ge, Sn, Li, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Ba, Ra, Hf, Pb, P, Pm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, Au, Ag, Re, Pr, Zn, Ga, Pd, Ir, Nd A, V, N and X are present in amounts such that the atomic ratio of A: V: N: X is a: b: c: d, where a = 1, b = 0.1 to 2, c = 0.1 to 1, d = 0.01 to 1, and e depends on the oxidation states of the other elements in the second mixed metal oxide catalyst.

The application belongs to the technical field of organic base compound preparation, and particularly relates to a production and preparation method of high-purity potassium methoxide. The application breaks through the reaction balance limitation of the traditional potassium hydroxide-methanol system by coupling three factors of segmented temperature control reaction, in-situ glycerol dehydration and composite modified diatomite adsorption, and realizes efficient preparation of high-purity potassium methoxide under the conditions of mildness, low toxicity and low cost. The segmented temperature control can remove free water of raw materials in the low-temperature section, accelerate the main reaction rate and continuously inhibit the reverse reaction of hydrolysis in the high-temperature section. The glycerol forms a stable hydrogen bond network by virtue of the multi-hydroxyl structure, in-situ reduces the water activity of the system, and promotes the reaction according to the Le Chatelier principle to fully convert the potassium hydroxide. The adsorbent can simultaneously realize the triple functions of free alkali capture, heavy metal complexation, and colloid and colored impurity removal. The obtained potassium methoxide has a purity of greater than or equal to 99.6%, low water content and heavy metal content, low colority, no organic by-products, high safety, and excellent comprehensive performance.

To provide a highly pure polyglycerol monofatty acid ester product and a producing method capable of obtaining a highly pure polyglycerol mono-fatty acid ester.SOLUTION: Products of polyglycerol monofatty acid esters, where the number of carbon atoms in the fatty acids is between 4 and 25, the peak intensity ratio represented by the formula (X) is 0.20 or higher, and the peak intensity ratio represented by the formula (Y) is 0.46 or lower. Formula (X)=P2 / P1 Formula (Y)=P3 / P1, where P1: the sum total of the peak intensities of the monoester, monoester dehydrated product, diester, diester dehydrated product, triester, and triester dehydrated product of polyglycerol fatty acid esters, when conducted mass spectrometry of polyglycerol mono fatty acid ester products using a flight time mass spectrometer P2: the peak intensity of polyglycerol fatty acid ester P3: the sum total of the peak intensities of polyglycerol and polyglycerol dehydrated product, when mass spectrometry of the polyglycerol mono fatty acid ester product is conducted using a time-of-flight mass spectrometer.SELECTED DRAWING: None

To provide a highly pure polyglycerol mono-fatty acid ester product and a production method capable of obtaining a highly pure polyglycerol mono-fatty acid ester. The fatty acid has 4 to 25 carbon atoms. The peak intensity ratio represented by the following formula (X) is 0.20 or more, A polyglycerol mono-fatty acid ester product having a peak intensity ratio represented by the following formula (Y) of 0.46 or less. Formula (X)=P2 / P1 Formula (Y)=P3 / P1 P1: The sum of peak intensities of monoesters, monoester dehydrates, diesters, diester dehydrates, triesters, and triester dehydrates of polyglycerol fatty acid esters, as well as polyglycerol and polyglycerol dehydrates, when mass spectrometry of polyglycerol mono fatty acid ester products is performed using a time-of-flight mass spectrometer. P2: Peak intensity of monoester of polyglycerol fatty acid ester when mass spectrometry of polyglycerol mono fatty acid ester product was performed using a time-of-flight mass spectrometer P3: The sum of the peak intensities of polyglycerin and polyglycerin dehydrates when the polyglycerin mono fatty acid ester product was subjected to mass spectrometry using a time-of-flight mass spectrometer.

The invention discloses a melt-alkalized attapulgite / platinum-based transition bimetallic catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and active components loaded on the carrier, the carrier is molten alkalized attapulgite, the active components are platinum and transition metal, and the transition metal is selected from iron, cobalt, nickel and copper. The catalyst disclosed by the invention can be applied to hydrogen production and value-added products by glycerol water-phase reforming under the condition of no additional hydrogen source, the stronger acid site of the catalyst is beneficial to glycerol dehydration to form hydroxyacetone, the value-added products such as 1, 2-propylene glycol and 1, 3-propylene glycol are further generated by hydrogenation on the acid site, and the catalyst shows a good industrial application prospect.

The application provides a shaped hydroxypropanone catalyst which is prepared from a hydroxypropanone catalyst powder, a binder, a pore-forming agent and a dilute acid solution. The hydroxypropanone catalyst provided by the application has a catalyst reaction life of not less than 600 hours in a reaction of preparing hydroxypropanone by dehydrating glycerol.

The invention discloses a method for preparing allyl alcohol through glycerol dehydration. In a continuous reactor, a raw material containing hydrogen and a glycerol aqueous solution is contacted and reacted with a catalyst to obtain a product containing allyl alcohol, the catalyst is a metal supported nitrogen coordination doped catalyst. The catalyst is prepared by the following steps: mixing an aqueous solution containing cyanate, a zinc source and a template agent, stirring, filtering, drying, roasting, pickling and drying to obtain the catalyst, according to the method, the glycerol which is cheap and easy to obtain is used as a production raw material for producing high-added-value products, so that the production cost can be effectively reduced. A continuous reactor is adopted for production, and the reaction is carried out under relatively mild reaction conditions; and the heterogeneous catalyst is convenient to separate from the product.

The present invention provides a high-aluminum hierarchical zeolite catalyst, a preparation method thereof and an application thereof, relating to the technical fields of catalyst preparation and application. In this preparation method, a high-aluminum zeolite (Si / Al = 2 - 10) parent body is successively subjected to framework modification, acid treatment and alkali treatment to obtain a hierarchical pore catalyst. Specifically, fluoride is used to perform framework modification on the high-aluminum zeolite to promote the transformation of the Al sites in the zeolite and their migration to the outer surface, and then an acid medium acts as a "scavenger" to remove the modified Al species. Through the synergistic effect of the two, the modulation of the Al sites in the high-aluminum zeolite can be achieved; combined with the alkali treatment strategy, Si species are selectively removed to construct intracrystalline mesopores, and a high-aluminum hierarchical zeolite with both micropores and intracrystalline mesopores is obtained. The hierarchical zeolite catalyst prepared by this method has a rich mesoporous structure, adjustable pore size distribution and mesoporosity degree, and shows high catalytic performance in the glycerol dehydration reaction.

The invention relates to a pervaporation membrane, a device and a process for crude glycerine dehydration. The pervaporation membrane comprises a hollow fiber support body and a selection layer arranged on the outer surface of the hollow fiber support body, and the selection layer comprises chitosan and 3-8 wt% of nano silicon dioxide according to the weight of the selection layer. The pervaporation membrane can significantly improve the water flux and the separation coefficient. The crude glycerine dehydration device comprising the pervaporation membrane has an integrated design of pretreatment, membrane separation and online cleaning, solves the problem of membrane pollution, and can realize continuous and stable operation.

The present invention relates to a method for the photocatalytic conversion of glycerol to prepare acetol and syngas. In this method, glycerol is used as a substrate, and under visible light irradiation, Mn-doped CdS (Mn / CdS) is used as a photocatalyst. Glycerol undergoes photocatalytic dehydration to obtain a liquid-phase product of acetol and a gas-phase product of syngas. The present invention provides a new method for the dehydration of glycerol to prepare acetol, with mild conditions and high product selectivity, and has good application prospects.

The invention provides an aluminum-rich hierarchical pore molecular sieve catalyst as well as a preparation method and application thereof, and relates to the technical field of catalyst preparation and application. According to the preparation method, an aluminum-rich molecular sieve (Si / Al = 2-10) matrix is sequentially subjected to skeleton modification, acid treatment and alkali treatment to obtain the hierarchical pore catalyst. Specifically, an aluminum-rich molecular sieve is subjected to framework modification through fluoride, Al site transformation and migration to the outer surface of the molecular sieve are promoted, then the effect of a scavenger is achieved through an acid medium, modified Al species are removed, and Al site modulation of the aluminum-rich molecular sieve can be achieved through the synergistic effect of fluoride and fluoride. And selectively removing Si species in combination with an alkali treatment strategy, and constructing intracrystalline mesopores to obtain the aluminum-rich hierarchical pore molecular sieve with micropores and intracrystalline mesopores at the same time. The hierarchical pore molecular sieve catalyst prepared by the method has rich mesoporous structures, adjustable pore size distribution and mesoporous degree, and shows high catalytic performance in glycerol dehydration reaction.